While some people prefer uninsulated snow pants, they typically require wearing more layers underneath, making them less comfortable. Insulated pants, which are great at keeping you warm even in very cold weather, typically feature light, low-profile synthetic insulation to add extra warmth. How much insulation you need will depend largely on two things—how cold it is likely to be where you will be wearing them, and how active you’ll be. If the weather is typically not too frigid and you’ll be moving around a lot, you might require only minimal insulation. On the other hand, if you are going to wear them in arctic-like weather or will be standing or sitting much of the time, you’ll need snow pants with a high insulation level.